| Autor: |
Mertelj, T., Kabanov, V. V., Gadermaier, C., Karpinski, J., Mihailovic, D. |
| Rok vydání: |
2008 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| Popis: |
We use femtosecond spectroscopy to investigate the quasiparticle relaxation and low-energy electronic structure in a near-optimally doped pnictide superconductor with T_c=49.5 K. Multiple relaxation processes are evident, with distinct superconducting state quasiparticle (QP) recombination dynamics exhibiting a T-dependent superconducting (SC) gap, and a clear "pseudogap" (PG) -like feature with an onset around 200K indicating the existence of a temperature-independent gap of magnitude \Delta_PG= 61 +- 9 meV above T_c. Both the SC and PG components show saturation as a function of fluence with distinct saturation thresholds ~0.15 \muJ/cm^2 and 1.5 \muJ/cm^2, respectively. |
| Databáze: |
arXiv |
| Externí odkaz: |
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